Tone-arm.



F HUTCHINGS.

TONE ARM. APPLICATION FILED, JAN. 12. 1916.

after an Patented J 1111 0 12, 1917.

rnann w. sometimes, on new Haven, connnc'ricur.

TONE-ARM.

menace,

Application filed January 12, 1916. Serial No. 71,670.

To all whom it may concern: Be it known that l, FRANK W. Huronmos, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Tone-Arins, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements.

in tone arms, and pertains more particularly to a tone arm for use in substitution of theusual tone arm of Columbia type of phonographs, which enables the playing therewith of records having hill and dale grooves, as distinguished from lateral record grooves which the Columbia machine is primarily and only designed to play. The usual type of tone arm mentioned is exemplified in the U. S. Patent issued to C. E. Woods, No. 1,108,302, dated August 25, 1914. The object of the invention is to provide a tone arm which is attachable to the vertical section of theusual tone arm shown in the patent mentioned, and which will enable the playing of records having the com monly termed hill and dale grooves, with out in any way changing or modifying the remainder of the structure. In brief, the invention resides in a tone arm which can be readily substituted for the usual tone arm which the Columbia machine is originally equipped with so as to allow the'playing of hill and dale groove'records.

In the drawings:

Figure '1, is a top plan view of the invcntion applied to a tone arm. of the Columbia type of talking machine; and

Fig. 2 is a plan. view of the invention detached.

The tonearm which forms the present in vention and which is to be substituted for the tone arm 7 in the patent above identified, is designated 1 and has an elbow' 2 formed in the same manner as in the Columbia type, and which is attachable to the 01% set neck or horizontal elbow 6 of the patent by merely removing the tonearm 7 of the patent, corresponding to arm 1 in the presscnt invention, and in then attaching the usual sound box S to the head 3.

This head has a hewand novel disposi- Specification of Letters Patent. Patented June 12, 191%;

tion with respect to the tone arm itself and-j: consequently to the record face in that first,

the axis of the head forms an acute angle- With a vertical plane passing through the main longitudinal axis of the tone arm, and is also inclined to the plane of the record disk. Thechead also has a disposition so that a plane passed through the axis of the ofiset head and the stylus bar will be per pendicular to the record face.

The stylus bar 4 is thus mounted in suchposition that a vertical plane therethrough will be approximately tangential to the record groove G at the point of contact of the stylus point and the groove, which tangential relationship however is less marked when the needle is at the outer circumference of the disk and gradually is accentu ated as the center is approached.

With the stylus bar arrangedas above described, the point thereof will always be in a position to occupy the center of the record groove to permit of playing of records with the hill and dale grooves, thus enabling the arm forming the present invention, to be substituted for the arm 7 of the patent,

to enable hill and dale records tobe played on a machine which otherwise is incapable so of playing records other than of the lateral typ What is claimed is:

1. A tone arm of the Columbia type with ofiset neck, having a sound box carryin head, at one end thereof, the axis of sai head forming an acute angle with a vertical plane passing through the main longitudinal axis ofthetone arm;

2. A tone arm of the Columbia type with ofiset neck, having a sound box carrying head at one end thereof, the axis ofsaid head forming an acute angle with a vertical plane passing through the main longitudinal axis of the tone arm, and also being inclined to the plane of the record disk,

3., A tone arm of the Columbia type with ofif'set neck, having a sound box carryin head at one end thereof, the axis of sai head forming an acute angle with a vertical plane passing through the main longitudinal axis of the tone arm, and also being inclined to the plane of the record disk, and the sound box being mounted on the head so that a plane passed through the axis of the ofiset head and the stylus bar will be perpendicular to the record face.

4:. An attachment for tone arms of the Columbia type, comprising a main tone arm member, and. a sound box mounted. thereon in, such a position that a vertical plane through the stylus bar will he tangent to the record groove at the point of contact of the stylus point and groove. In testimony whereof I aflixed my signature.

FRANK W. HUTCHINGS.

c 10 have hereunto 

